On Tue, Dec 8, 2009 at 4:50 PM, Gray Calhoun <gray.calh...@gmail.com> wrote:
> I think there might be a problem with this approach if roi, tid, rt,
> and mood are the same for nonconsecutive rows.
True, but I can use the index of my reshape solution. Aggregate was
the crucial ingredient. Thanks both!
For the record, this is the full solution:
head(d)
rt dur tid mood roi x
55 5523 200 4 subj 9 5
56 5523 52 4 subj 7 31
57 5523 209 4 subj 4 9
58 5523 188 4 subj 4 7
70 4016 264 5 indic 9 51
71 4016 195 5 indic 4 14
index <- c(TRUE,diff(d$roi)!=0)
d2 <- d[index,]
index <- cumsum(index)
d2$dur <- aggregate(d$dur, list(index=index), sum)[2]
d2$x <- aggregate(d$x, list(index=index), mean)[2]
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